Price is a function of value, not cost. In this case the value is in managing your tasks in a way that means they get done. The sheer number of To Do list apps

Price is a function of value, not cost. In this case the value is in managing your tasks in a way that means they get done. The sheer number of To Do list apps and services should tell you that this is truly a hard problem to solve - managing a task list is trivial, but doing it in a way that drives someone to do their tasks is immensely difficult. If the app enables you to do that then $150 to actually keep on top of tasks you need to do is an amazing bargain.